A method for recovering an image passing through a display (2) and taken by an image sensor (6) disposed on a rear side of the display (2), the method includes acquiring the image taken by the image sensor (6), obtaining a plurality of point spread functions corresponding one-to-one to a plurality of dots (D) arranged in a predetermined pattern on a calibration chart (CC), and performing a de-convolution of the image based on the plurality of point spread functions to recover the image.